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The Sino-German 6cm polarization survey of the Galactic plane http://159.226.88.6/zmtt/6cm Total intensity Polarized intensity Xiaohui Sun NAOC

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The Survey Team Richard Wielebinksi (MPIfR) Wolfgang Reich (MPIfR) Patricia Reich (MPIfR) Ernst Frst (MPIfR) Peter Mller (MPIfR) Otmar Lochner (MPIfR) Jinlin Han (NAOC) Xiaohui Sun (NAOC) Li Xiao (NAOC) Xuyang Gao (NAOC) Weibin Shi (SDU) Maozheng Chen (UAO, NAOC) Jun Ma (UAO, NAOC)

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The 6cm receiving system Urumqi telescope D 25m longitude 87 o E latitude 43 o N altitude 2029m central frequency: 4.8/4.963 GHz bandwidth: 600 MHz/295 MHz system temperature: 22 K-25 K HPBW: 9.5arcmin first side lobe: 2% instrumental polarization:

Faraday Screens no total intensity correspondence: ne ~10 G Troland & Heiles 1986: |B| ~ n ~0.5 FS Cannot be found at low frequency as too large RMs Should be carefully omitted for analysis of RMs of EGSs

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Polarization structures Polarization voids: depth depolarization NO beam depolarization NO BG + FS + FG PI (image) + B (bar) + I (contour )

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Polarization structures Polarized Patches: BG+FS+FG difficult turbulent field probably properties of turbulent fileds? Canals: external RM gradient NO boundaries of patches PI (image) + B (bar) + I (contour )

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Summary 1. The Galactic plane is surveyed for polarization at 6cm 2. Polarization structures: voids, canals, patches, Faraday screens, depolarization regions 3. SNRs & HII regions detected 4. Diffuse emission & polarization: Thermal & non-thermal

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Thanks!